Carriers are associated with transmission of disease in all except :

Question

Question

This question was previously asked in

MP Mahila Supervisor Official Paper (Held on: 28 Mar, 2017 Shift 1)

Answer 1

Correct Answer: Measles

Rationale:

Measles is primarily spread through respiratory droplets when an infected person coughs or sneezes. This highly contagious virus does not typically involve carriers in its transmission. Instead, it spreads directly from person to person through airborne droplets.
The measles virus can live for up to two hours in an airspace where the infected person coughed or sneezed, making it possible for someone else to become infected by breathing in these droplets.
Individuals are most contagious from four days before to four days after the rash appears, and the disease is not known for having asymptomatic carriers who can transmit the virus without showing symptoms.

Explanation of Other Options:

Cholera

Rationale: Cholera is an infection of the small intestine by the bacterium Vibrio cholerae. It is often spread through contaminated water or food. Carriers, especially those who are asymptomatic, can harbor the bacteria and spread it to others through fecal contamination.
Cholera carriers can excrete the bacteria in their stool, potentially contaminating water sources and leading to outbreaks in areas with poor sanitation.

Typhoid

Rationale: Typhoid fever is caused by the bacterium Salmonella typhi. It is transmitted through the ingestion of contaminated food or water. Chronic carriers can harbor the bacteria in their gallbladder and shed it intermittently in their stool, spreading the disease to others.
Asymptomatic carriers play a significant role in the transmission of typhoid, especially in endemic areas.

Diphtheria

Rationale: Diphtheria is caused by the bacterium Corynebacterium diphtheriae. It spreads through respiratory droplets or close contact with an infected person. Carriers, particularly those without symptoms, can harbor the bacteria in their throat or nose and transmit it to others.
Asymptomatic carriers can be a source of infection, especially in communities with low vaccination coverage.

Conclusion:

Among the given options, measles is the disease least associated with carrier transmission. It primarily spreads through direct respiratory droplets from symptomatic individuals, unlike cholera, typhoid, and diphtheria, which can involve asymptomatic carriers in their transmission cycles.